Tides are most visible a. on shores and coasts. b. in the middle of the ocean. c. wherever the water temperature is warmest. d. in freshwater bodies, such as lakes, rivers, and streams

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?